Abstract
The applying of local building materials is an effective contribution to the savings of mineral resources, which are used for the production of basic building materials. Clay and gypsum compositions are the local raw materials in many regions of the country and some neighboring countries. The article discusses the method for determining the clay fraction in the clay and gypsum composition, as well as the method for assessing the rheological characteristics of the plaster mixtures for interior work based on clay and gypsum binder. It was established that the content of the clay fraction in the studied clay and gypsum composition is in the range of 30–32%. Plaster mixtures based on clay and gypsum binder can be considered as optimal compositions under the following conditions. The grade of mobility is not less than PK3 (8–12 cm) in cone penetration test, the ultimate shear stresses in the first seconds of the thixotropic hardening ensure no runoff for the adjusted thickness of the applied layer. With the mentioned mobility, the “creeping” on the concrete surface is 10% and less, and the “creeping” on the brick surface is no more than 5%. The allowable water-solid ratio is 0,46–0,50.
Highlights
Clay and gypsum compositions can be considered as natural building composites since they are a relatively dense conglomerate consisting of the calcium sulfate dihydrate, the clay minerals, the silica, and other impurities
It was found that 38.7% of the dust and clay particles were decanted after 2 hours of soaking; 43.8% of dust and clay particles were decanted after 24 hours of soaking of clay and gypsum binder
The clay and gypsum binder can be used as the basis of plaster compositions
Summary
Clay and gypsum compositions can be considered as natural building composites since they are a relatively dense conglomerate consisting of the calcium sulfate dihydrate (gypsum), the clay minerals, the silica, and other impurities. A complex of modifying additives is added into the composition of the clay and gypsum binder, as well as into the plaster dry building mixtures. A lot of Soviet researchers in the 40s and 70s of the twentieth century were studying the properties of clay and gypsum binders and the possibility of their use in the construction. After the 70s of the last century, no studies of the clay and gypsum composition have been conducted [6,7,8,9,10]
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